# math homework help 13

(5 points) Choose a population and a quantitative variable which is

approximately normally distributed within this population. Clearly

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state your choices in a few sentences.

2. (20 points) Justify why your variable is normally distributed within its

population in a few sentences.

3. (15 points) Guess a value for the population standard deviation Ïƒ.

Justify your guess in a few sentences.

4. (20 points) Collect a simple random sample of 20âˆ’30 individuals from

and justify why it is a simple random sampling method in one to two

paragraphs.

5. (30 points) Compute z-confidence intervals using your sample data,

guess of Ïƒ, and confidence levels of 90%, 95%, and 99%. Your work

should include the value of Ì„x, your z

âˆ—

-value for each confidence level,

and the actual intervals themselves.

6. (10 points) Explain what these three confidence intervals together tell